55445405 has 8 divisors (see below), whose sum is σ = 66605784. Its totient is φ = 44308800.

The previous prime is 55445399. The next prime is 55445413. The reversal of 55445405 is 50454455.

It can be written as a sum of positive squares in 4 ways, for example, as 5134756 + 50310649 = 2266^2 + 7093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-55445405 is a prime.

It is a super-2 number, since 2×55445405² = 6148385871228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326 + ... + 10535.

It is an arithmetic number, because the mean of its divisors is an integer number (8325723).

Almost surely, 2^55445405 is an apocalyptic number.

It is an amenable number.

55445405 is a deficient number, since it is larger than the sum of its proper divisors (11160379).

55445405 is a wasteful number, since it uses less digits than its factorization.

55445405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11887.

The product of its (nonzero) digits is 40000, while the sum is 32.

The square root of 55445405 is about 7446.1671348419. The cubic root of 55445405 is about 381.3190655133.

The spelling of 55445405 in words is "fifty-five million, four hundred forty-five thousand, four hundred five".